package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.Follow;
import com.hmdp.mapper.FollowMapper;
import com.hmdp.service.IFollowService;
import com.hmdp.service.IUserService;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

@Slf4j
@Service
public class FollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Resource
    private IUserService userService;

    @Override
    public Result follow(Long followUserId, boolean isFollow) {
        //1.获取登录用户
        Long userId = UserHolder.getUser().getId();
        String key = "follows:" + userId;
        //1.判断到底是关注还是取关
        if (isFollow) {
            //2.关注，新增数据
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            boolean isSuccess = this.save(follow);
            // 在方法中添加测试代码
            Follow testFollow = new Follow();
            testFollow.setUserId(1L);
            testFollow.setFollowUserId(111L);
            baseMapper.insert(testFollow);
            log.info("直接使用Mapper插入测试数据");

            if (isSuccess) {
                //把关注的id，放入redis的set集合中  sadd userId followUserId
                stringRedisTemplate.opsForSet().add(key, followUserId.toString());
            }
        } else {
            //3.取关，删除 delete from tb_follow where userId = ? and follow_user_id = ?
//            remove(new QueryWrapper<Follow>().eq("follow_user_id", followUserId));
            boolean isSuccess = lambdaUpdate().eq(Follow::getUserId, userId).eq(Follow::getFollowUserId, followUserId).remove();
            if (isSuccess) {
                //把关注的用户id从redis中的set集合中移除
                stringRedisTemplate.opsForSet().remove(key, followUserId.toString());
            }
        }
        return Result.ok();
    }

        @Override
        public Result isFollow (Long followUserId){
            //1.获取登录用户
            Long userId = UserHolder.getUser().getId();
            //2,查询是否关注 select count(*) from tb_follow where user_id = ? and follow_user_id = ?
            Integer count = query().eq("user_id", userId).eq("follow_user_id", followUserId).count();
            //3,判断
            return Result.ok(count > 0);
        }


    @Override
    public Result followCommons(Long id) {
        //1.获取当前用户
        Long userId = UserHolder.getUser().getId();
        String key = "follows:" + userId;
        //2.求交集
        String key2 = "follows:" + id;
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect(key,key2);
        if (intersect == null || intersect.isEmpty()) {
            //无交集，返回个空集合，以免报错
            return Result.ok(Collections.emptyList());
        }
        //3,解析id集合
        List<Long> ids = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        //4,查询用户
        List<UserDTO> users = userService.listByIds(ids)
                .stream()
                .map(user -> BeanUtil.copyProperties(user,UserDTO.class))
                .collect(Collectors.toList());
        return Result.ok(users);
    }
}
